topic Re: GeometryService.Relation NON-IDENTICAL? in ArcGIS API for Flex Questions

GeometryService.Relation NON-IDENTICAL?

TylerWaring — Fri, 05 Nov 2010 19:03:33 GMT

Greetings Everyone,
I have been struggling to figure out how to perform a spatial test on a graphics layer and a featureset.

What I am trying to do is extend the graphical search functionality in the search widget so that a user can press the ???A??? key and add additional features to both the graphics layer and the RecordData class object.

I have figured the main functions for this extension but now I am finding that if the added features overlap the existing graphics layer then duplicates will be produced in both the graphics layer and the RecordData class object.

To overcome this problem, I would like to use compare the existing in map graphicslayer to the new featureset that is produced when an additional graphical query is made. I think I am looking to use a GeometryService.relation method with the spatialRelationship parameter set to SPATIAL_REL_RELATION. However I have no Idea how to set up the comparisonString.

I???ve tried to jump into the Shape Comparison Language documentation but I must admit that it is completely over my head. I have tried my best to generate the correct parameters but I am obviously doing something wrong. Here is what I???ve got:

myGeometryService.relation(compareArray1, compareArray2,GeometryService.SPATIAL_REL_RELATION,"compareArray1 != compareArray2")

The Error I get whilst running this method is:

[FaultEvent fault=[RPC Fault faultString="Object reference not set to an instance of an object." faultCode="500" faultDetail="Unable to perform the relation operation"] messageId=null type="fault" bubbles=false cancelable=true eventPhase=2]

Does anyone know what I may be doing wrong?

Thanks
Tyler Waring

Re: GeometryService.Relation NON-IDENTICAL?

DasaPaddock — Mon, 08 Nov 2010 17:23:52 GMT

Another option could be to try and prevent the duplicates by not letting the server return the features that have already been loaded. Try adding a NOT IN SQL clause to the Query.where property.

e.g. OBJECTID NOT IN (1, 2, 3, ...)

Re: GeometryService.Relation NON-IDENTICAL?

TylerWaring — Wed, 10 Nov 2010 16:48:06 GMT

Thanks, That's exactly what I needed. Thanks for finding the right size solution for my problem.

I am curious though, how do you integrate the Shape Comparison Language with a Flex applicaiton using GeometryService.SPATIAL_REL_RELATION? It sounds both interesting and powerful.

Any information will be greatly appreciated.

Tyler

Re: GeometryService.Relation NON-IDENTICAL?

nicogis — Sun, 23 Jan 2011 17:03:26 GMT

in relation you can write
myGeometryService.relation(compareArray1, compareArray2,GeometryService.SPATIAL_REL_RELATION ,"G1 != G2")

you must use G1 (compareArray1) and G2(compareArray2) and not compareArray1 and not compareArray2

confront is done for index:
compareArray1[0] with compareArray2[0]
compareArray1[1] with compareArray2[1]
.....

IDENTICAL (G1, G2) = TRUE
IDENTICAL (G1, G2) = FALSE
G1 == G2
G1 = G2
G1 != G2

you also can reverse order

G2 != G2
....